How to find and replace a value in a file with a command in the terminal?

Question

Command line

I almost never worked with the terminal, for convenience I want to create a script to disable opcache when necessary and enable it back!
The task is as follows:
There is a file php.iniin it, you need to change the value in the line opcache.enable=0to opcache.enable=1
After restart php
And if you can set the condition

if (opcache.enable==0){ opcache.enable=1; }else{ opcache.enable=0;}

that would be absolutely great!
Tried with SED but nothing works...

Answer 1

https://habr.com/company/ruvds/blog/327530/
In particular

$ echo "This is a test" | sed 's/test/another test/'